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Metric Screw Threads: M Profile
B1.13M - 2005
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This Standard contains general metric standards for a 60 deg. symmetrical screw thread with a basic ISO 68-1 profile designated M profile. The M profile threads of tolerance class 6H/6g are intended for metric applications where inch class 2A/2B have been used. At the minimum material limits, the 6H/6g results in a looser fit than the 2A/2B. Tabular data is also provided for a tighter tolerance fit external thread of class 4g6g which is approximately equivalent to the inch class 3A but with an allowance applied. Formulation and tolerancing data is included for applications requiring other fits. Note: A 4H5H/4h6h is approximately equivalent to a class 3A/3B fit in the inch system.
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Publish Date: 2005
Reaffirmed: 2015
Language: English
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已知椭圆X^2/a^2&+Y^2/b^2&=1上任意一点M（除短轴端点外）与短轴两端点B1,B2的连线分别与X轴交于P,Q两点
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（1）由已知可设M（-c，y）， 则有 (-c) 2 a 2 + y 2 b 2 =1． ∵M在第二象限，∴M（-c， b 2 a ）． 又由AB ∥ OM，可知k AB =k OM ． ∴- b 2 ac =- b a ．∴b=c．∴a= 2 b． ∴e= c a = 2 2 ． （2）设|F 1 Q|=m，|F 2 Q|=n， 则m+n=2a，mn＞0．|F 1 F 2 |=2c，a 2 =2c 2 ， ∴cos&F 1 QF 2 = m 2 + n 2 -4 c 2 2mn = (m+n) 2 -2mn-4 c 2 2mn = 4 a 2 -4 c 2 2mn -1= a 2 mn -1& a 2 ( m+n 2 ) 2 -1= a 2 a 2 -1=0． 当且仅当m=n=a时，等号成立． 故&F 1 QF 2 &[0， & 2 ]． （3）∵CD ∥ AB，k CD =- b a =- 2 2 ． 设直线CD的方程为y=- 2 2 （x+c）， 即y=- 2 2 （x+b）． 消去y，整理得 y=- 2 2 （x+b）． 则 x 2 a 2 + y 2 b 2 =1， （a 2 +2b 2 ）x 2 +2a 2 bx-a 2 b 2 =0． 设C（x 1 ，y 1 ）、D（x 2 ，y 2 ），∵a 2 =2b 2 ， ∴x 1 +x 2 =- 2 a 2 b a 2 +2 b 2 =- 4 b 3 4 b 2 =-b， x 1 ?x 2 =- a 2 b 2 a 2 +2 b 2 =- 2 b 4 4 b 2 =- b 2 2 ． ∴|CD|= 1+ k 2 |x 1 -x 2 | = 1+ k 2 ? ( x 1 + x 2 ) 2 -4 x 1 x 2 = 1+ (- & 分享 评论 | 给力0 不给力0 娴熟小胤子QY62 | 四级 采纳率66% 擅长： 暂未定制 其他类似问&br/&&br/&
自椭圆x^2/a^2+y^2/b^2=1（a&b&0）上一点... &br/&&br/&
如图所示,从椭圆x^2/a^2+y^2/b^2=1(a&b&... &br/&&br/&
已知椭圆(x^2)/(a^2)+(y^2)/(b^2)=1(... 1&br/&&br/&
右图,从椭圆(x^2/a^2)+(y^2/b^2)=1[a＞... 12 更多相关问题&& 为您推荐： 椭圆的相关知&br/&&br/&
已知椭圆的对称轴为坐标轴，短轴的一个端点与两焦点组成一个... 25&br/&&br/&
已知椭圆的中心在原点,焦点为F1(0,-2&2) 8&br/&&br/&
椭圆准线方程 48&br/&&br/&
椭圆离心率 3&br/&&br/&
椭圆有几条对称轴 38 更多关于椭圆的问题&& 等待您来回答 1回答 100 1. 数车2号刀2号补偿的指令是（ ）。&br/&&br/& 登录 还没有百度账号？立即注册 1 精彩知识在知道 百度知道品牌合作指南 【真相问答机】，揭穿流言！
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